The Queensland Coroner has found a police officer acted reasonably when he shot a man dead in Brisbane last year.

Coroner Michael Barnes has cleared Constable Thomas Hess of wrongdoing over the fatal shooting of Jason Protheroe at a house at Bracken Ridge on Brisbane's northside in April last year.

He found Constable Hess believed Mr Protheroe was brandishing a gun at him.

Mr Barnes dismissed theories of a police cover-up and said evidence from Mr Protheroe's girlfriend, Krystal Sinn, was unreliable.

However, Mr Barnes found police had committed misconduct by leaking the pair's criminal histories to the media and wants the Crime and Misconduct Commission to investigate.

The coroner has also recommended that police review who can access crime scenes and how much information is given to union officials.

Officer support

Queensland Police Union (QPU) president Ian Leavers says it is a relief for Constable Hess and another officer who was present.

"They have been vindicated today and that is very pleasing," he said.

He apologised for making untrue statements to the media after the fatal shooting, but says he is not responsible for publicly releasing the criminal histories of Mr Protheroe and Ms Sinn.

Mr Leavers also says he must be allowed to publicly support officers.

"I'm happy to work with the Police Commissioner as a result of some of the Coroner's recommendations," he said.

"I find it very concerning at the suggestion the family can make scurrilous accusations - and the Coroner actually used the word "preposterous", some of the things they said - but police cannot be defended.

"Now I'm happy for accountability, it's important for the public to have confidence in the police, but I believe if comments are made accusing the police of certain things then police are entitled be supported."

'Book of lies'

But Jason Protheroe's father, Stephen, says the inquest has not revealed the truth.

"We still don't have it and we're going to keep going until we find what really happened on that day," he said.

"It's a book of lies - we're going to go home and go through all the facts.